Create poll-closed.md (#286)

Adding the details for the YouTube Poll Closed trigger. Please correct it if I didn't add the note correctly.

streamerbot/3.api/2.triggers/youtube/polls/poll-closed.md

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+---
+title: Poll Closed
+description: Trigger that occurs when a poll is closed
+variables:
+  - name: poll.question
+    type: string
+    description: The question asked
+  - name: poll.totalVotes
+    type: int
+    description: The total number of votes cast
+  - name: poll.options.count
+    type: int
+    description: The number of available options
+  - name: poll.option0.text
+    type: string
+    description: The first poll option listed
+  - name: poll.option0.votes
+    type: int
+    description: The number of votes cast for the first option
+  - name: poll.option1.text
+    type: string
+    description: The second poll option listed
+  - name: poll.option1.votes
+    type: int
+    description: The number of votes cast for the second option
+  - name: poll.winningOption.text
+    type: string
+    description: The option that received the most votes OR if there is a tie, the first listed option that tied
+  - name: poll.winningOption.votes
+    type: int
+    description: The number of votes cast for the winning option
+commonVariables:
+  - YouTubeUser
+  - YouTubeBroadcast
+  - YouTubeBroadcaster
+---
+
+::note
+  **If you have more than two options they will appear as poll.option2.text, poll.option2.votes, poll.option3.text, poll.option3.votes, and so on**
+::